Collapsible form for forming circular concrete structures.



COLLAPSIBLE FORM FOR FORMING CIRCULAR CONCRETE STRUCTURES.

APPLICATION FILED JAN. 7,1915.

1,182,578. Patented May 9,1916.

v 2 SHEETS-SHEET 2- fir: l9 3/ 24 f WITNESSES:

0 I 4 r ATTORNEY PATRICK MCGUIRE, OF KEEWATIN, MINNESOTA.

COLLAIPSIBLE FORMIOR FORMING- CIRCULAR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented May a, 1916.

Application filed. January 7, 1915. Serial No. 981.

To all whom it may concern Be it known that I, PATRICK MCGUIRE,

a citizen of the United States, residing at Keewatin, in the county of Itasca and State of Minnesota, have invented certain new and useful Improvements in Collapsible Forms for Forming Circular Concrete Structures, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to improvements in collapsible forms for forming circular concrete structures.

The object of my invention is to provide a form of this character which would be readily set up and collapsed, and is especially designed to be used in building of cylindrical structures such as smoke stacks, water tanks, silos or the like.

Another object of my invention is to provide, a collapsible form of this character which is simple in construction and one that will retain perfect alinement both vertically and horizontally and having certain details of structure and operation hereinafter more fully set forth.

In the accompanying drawings :Figure 1 is a side elevation of one of the staves of which my improved form is made and showing interlockingmembers. Fig. 2 is'a side elevation of one of the staves used for forming the inner wall of the form. Fig. 3 is an edge view of Fig. 1. Fig. 4; is an end view of Fig. 2. Fig. 5 is a side elevation of the improved cable tightening turn-buckle. Fig. 6 is a top plan view of Fig. 5. Fig. 7 is a bottom plan view of Fig. 5. Fig. 8 is a perspective view of a group of staves in position as used to form the inside of the concrete structure showing the securing bands in their proper positions. Fig. 9-is a perspective view similar to Fig. 8 of a group of staves assembled to form the outer structure, with the inclosing cables in position.

Referring now to the drawings, 1 represents a wooden stave which, taken together with other staves, form the outside of the mold for molding the concrete circular structure. The edges of the wooden staves are slightly beveled for the purpose of forming the outer wall of a circular form. It is understood that any number of these staves may be employed for this purpose, the num ber used being determined by the size of the circular structure to be constructed. These staves are of any desired length, but preferably of such a length that they can be readily handled.

Attached to the upper end of the wooden staves are the metallic cap portions 4: which snugly fit the upper edge of the staves flush with the upper end and secured thereto by means of screws or in any other suitable, manner. These caps 4 are provided on their outer edges with the downwardly extending portions 2 which are formed integral therewith. The upper ends of the caps are provided with knobs 5 designed to be of such a size as to interlock with a recess formed of the stave above as will be later described. The portion 2 is adapted to closely fit the outside of the upper end of the stave 1 and has a lug portion 7 integral therewith and provided with a groove or slot 8 into which the tightening or holding cables hereinafter more fully described pass.

At one side ofthe portion 6 of the at. tachment 2 is an outwardly extending male portion 9 which extends beyond the edge of the stave a distance suitable for interlocking with the female recess 10 of the adjoining stave. The lower end of the stave is provided with an attachment ll somewhat similar to the attachment 2 carriedby the upper end of the stave and provided with a U-shaped portion 12 fitting closely with the lower end of the stave and provided with projecting flanges extending downwardly sufiiciently to contain the knobs 5 carried by the upper endof'the staves below. The attachment 11 is also provided with the lugs 18 having the grooves 14 therein for receiving the securing cable passing around the form. The attachment 11 is also provided with a male portion 15 and female portion 16 forming the interlocking means. The male portion 15 extends outwardly beyond the edge'of the stave and is adaptedto enter the female portion 16 of the adjoining stave as clearly shown in Fig. 9 of the drawings. The attachments 2 and 11 are secured to the ends of the staves by means of the screws 3 and 16 as fully shown in Figs; 3 and 4 of the drawings. The male portions 9 and 15, carried by the stave 1 are sufficiently flexible to accommodate themselves to the curve which they must take on the outer wall of the form as clearly shown in Fig. 9 of the drawing. The inner staves forming. the inner form designated by the reference numeral 1 are constructed the same as that shown in Fig. l of the drawings only they have their edges beveled in the opposite direction so as to assume the reverse curve as that formed by the stave 1 and whereby they are held together from inward movement.

The attachment 11 is exactly the same as extending lug 33- which is for the purpose hereinafter more fully described.

It will be readily seen that the series of staves equipped in the form shown in Fig. 1 of the drawings when placed side by side and slightly beveled and having the members 9, 10, 15 and 16 interlocked, willform a continuous circular form about the out side of a given circular space and be self sustained. It may be also seen that'another similar series are mounted upon the first and interlocked therewith by means of the U-shaped portions 12 of the attachment 11 of the upper series and the knobs 5 of the lower series. Additional interlocking effect along the edges of the staves may be had by tongue-and grooving thereon, not shown on the drawings. In addition in order to form a more perfectunion of the staves, I provide cables 17 and 17"'pass ing through the grooves S and 1d holding theseveral'staves together to form the outer wall of the circular form. As a means of tightening these cables, I provide a turnbuckleattachment shown in Fig. 5 of the drawingswhich is of such a length less than that of the staves as to bring the cables in alinement with the recesses 8 and 1a in the plates 2 and 11 carried by the staves. The turn-buckle consists of a frame 18 terminat ing at its extremities in the blocks 19 and 20. These blocks may be of either wood or metal or may be formed integral therewith.

. Screws 21 and 22 are mounted therein which screws terminate at their upper ends in the square portions 23 and 24 respectively. These squared portions serve as means for rotating the screws whereby-the cables are tightened as will be later described. Mounted upon the screws or worms 21 and 22 are the nuts 25 and 26 respectively which are provided with grooves suitable for the passing around of the cables. The blocks 19 and 20 are pierced by holes 27 and 28 at a point approximately at the center thereof and through which one end of the cables 17 is passed and firmly secured. Grooves 29 and 30 are provided with the blocks 19 and 20 for the passing of the cables therethrough, it being the design to pass the cables in this point through the entire se ries of the staves by means of the grooves 8 and 14 thence they willreturn to the turnbuckle fromthe opposite direction. This is for the purpose of providing grooved portions 31 and 32 for the return of the cable,

it being designed to passthe free end about the nuts 25 and 26 within grooves therein and toattach said free end thereto by means of loops as shown in Fig. 5 of the drawing. It will be seen from the above that by turning the screws or worms 21 and 23, the nuts 25 and 26 will travel up and down as the case may be, thus drawing upon the cable 17 and therefore tightening them about the circular series of staves and locking them in their circular form. By this structure it will be seen that a rigid cylinder is formed presenting a smooth, unbroken inner surface which is most desirable for the forming of an outerwall for a concrete structure of this nature. It will also be seen that a reversal of the above operation would cause the cables to slacken which would allow for the disassembling of the several staves forming the outside form for the concrete structure.

The means for Supporting the inner wall of the cylinder structure in suitable position, with the staves 1 hereinafter referred to, are used and set up one alongside the other with the interlocking members 9, 15, 10; and 16 in their interlocked position.- These stares are also provided with knobs 5 mounted upon similar attachments asthat shown in Fig. 1 which provides for the building up of the staves one upon the other. These staves, of course, are slightly beveled, but in an oppositedirection to that of' the stave 1 in order that the curve formed thereby may be the reverse of that formed by the outer staves. These staves are also provided with the male and female portions 9 and 10, 15 and 16, but the lugs 7 and Band grooves 8 and 14 are omitted on these staves. In place of the lugs 8, 1 provide the single hooked portion 33 formed integral. withjthe attachment 2. This hooked portion is designed to have the band at pass around the inner staves under the hook to retain the inner wall inits proper position and also; to reinforce the same against the pressure of the concrete between the forms It willbe seen from the foregoing that a series of these inner staves placed side by .side and interlocked by means of their male and fe male interlocking portions 9 and 10, 15,- and tion what I claim and desire to secure by Letters Patent is:

1. A device of the character described comprising a stave, metal caps fixed upon the ends of the stave, a longitudinal projection upon the cap upon one end of the stave and a groove in the cap upon the opposite end whereby a series of staves may be assembled abutting each other and held in alinement by the cooperating projections and grooves. j

2. A stave for collapsible forms having fixed upon one end a metal cap having an upwardly projecting knob and a down wardly extending portion carrying a laterally extending male member, a female memher and a binder receiving lug, a metal cap fixed to the opposite end of the stave and leaving a downwardly projecting groove, an upwardly projecting portion carrying a laterally extending male member, a female member and a binder receiving lug, as for the purpose described.

3. A device of the character described, comprising elongated wooden staves having metal caps covering the ends thereof, said caps each having an arm and socket for cooperation with the next adjacentcaps, the lower cap having a socket in its lower face and the upper cap having a projection on its upper face whereby series of staves are adapted to be set one upon the other and adjustably held in alinement.

4. In a device of the character described, elongated wooden staves having metal caps covering the ends thereof, said caps each having male and female members for cooperation with the next adjacent similarly equipped stave. I

5. In a device of the character described, elongated wooden staves having metal caps covering the ends thereof, said caps each having male and female members for interlocking cooperation with the next laterally adjacent similarly equipped staves and male and female cooperating members for engagement with the next vertically adjacent similarly equipped staves.

6. A stave for making concrete structures provided with metal caps covering the ends and extending down one side thereof, the tops of the upper and lower caps provided with studs and grooves respectively, the side portions provided with a laterally extending member and a recess opposite thereto, the said laterally extending member adapted to snugly fit within the recess of the cap of the adjacent stave and locking the said stave against vertical movement and means engaging the extension of the caps of the said staves for holding them against lateral movement.

7 A stave for making concrete structures provided with caps on the ends thereof, means carried by the caps for uniting the staves and holding them against vertical movement and means engaging the face of the said staves for holding them against lateral movement.

8. A stave for making concrete structures comprising a wooden member provided with metal caps on each end thereof, means carried by the caps for uniting the staves and holding them against vertical movement, the said means comprising snugly fitting male and female members and means engaging the said caps for holding the staves against, lateral movement.

9. A stave for making concrete structures comprising a wooden body portion provided with metal caps on each end thereof, means carried by the caps for uniting the staves and holding them against vertical movement, and means engaging the said caps for holding the staves against lateral movement.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

PATRICK MCGUIRE. /Vitnesses:

C. G. DUNN, A. C. DUNN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, D. c. 

